Formulation Stability and Ingredient Solubility Issues
Asked by: vichai_chan
On: July 22, 2022
Product Type:
Cosmetics
Question
Regarding a formulation containing Ezerwax, Pure-Baicalin, Olive Oil PEG-7 Esters, and other ingredients, I would like to know if Ezerwax and Pure-Baicalin are soluble in Olive Oil PEG-7 Esters, and if Olive Oil PEG-7 Esters is sufficient to emulsify the oil phase to achieve a stable formula.
Answer
Formulation Review
Based on the ingredients provided in your formula:
Solubility of Ezerwax and Pure-Baicalin in Olive Oil PEG-7 Esters:
- Ezerwax is an oil-soluble ingredient (a wax blend). Olive Oil PEG-7 Esters is a water-soluble emollient/solubilizer. Therefore, Ezerwax will not dissolve in Olive Oil PEG-7 Esters.
- Pure-Baicalin is a water-soluble extract. It will dissolve in the water phase of your formula, where Olive Oil PEG-7 Esters is also soluble. However, Pure-Baicalin does not dissolve directly in Olive Oil PEG-7 Esters itself.
Emulsification Stability using Olive Oil PEG-7 Esters:
- Olive Oil PEG-7 Esters is primarily designed as a water-soluble emollient or solubilizer for incorporating small amounts of oils or fragrances into water-based systems like toners or cleansing waters. It is generally not a sufficient emulsifier to create a stable emulsion (like a cream or lotion) with a significant oil phase.
- Your formula includes 5% Ezerwax (an oil-soluble wax) and 5% Olive Oil PEG-7 Esters. Relying solely on Olive Oil PEG-7 Esters to emulsify this amount of oil-soluble material will likely result in stability issues and separation of the water and oil phases over time.
To achieve a stable emulsion, you would typically need to include a proper emulsifier system designed for your specific oil phase percentage and desired product type (e.g., a non-ionic emulsifier blend for an oil-in-water emulsion).
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